“…Heavy buyers, particularly those with high levels of attitudinal commitment, have the strongest motivation to enroll in an LP because they can reap the most benefits from the program without having to change their purchase behavior or substantially increase their effort (Demoulin and Zidda, 2009;Dholakia, 2006;Kivetz and Simonson, 2003;Mauri, 2003;Stauss et al, 2005;Wright and Sparks, 1999). Although the percentage of such members among all consumers is low (6%-12%), they exert a strong influence on new member enrollment through social interaction, such as word-of-mouth recommendations (Allaway et al, 2003(Allaway et al, , 2006. Recognizing the LP member's ability to attract new customers, US online skin-care retailer Cleopatra's Choice launched their Referral and Loyalty Program which rewards members for each new customer they bring, in addition to the usual LP rewarding based on spending.…”